2 * VFIO: IOMMU DMA mapping support for TCE on POWER
4 * Copyright (C) 2013 IBM Corp. All rights reserved.
5 * Author: Alexey Kardashevskiy <aik@ozlabs.ru>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * Derived from original vfio_iommu_type1.c:
12 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
13 * Author: Alex Williamson <alex.williamson@redhat.com>
16 #include <linux/module.h>
17 #include <linux/pci.h>
18 #include <linux/slab.h>
19 #include <linux/uaccess.h>
20 #include <linux/err.h>
21 #include <linux/vfio.h>
22 #include <linux/vmalloc.h>
23 #include <asm/iommu.h>
25 #include <asm/mmu_context.h>
27 #define DRIVER_VERSION "0.1"
28 #define DRIVER_AUTHOR "aik@ozlabs.ru"
29 #define DRIVER_DESC "VFIO IOMMU SPAPR TCE"
31 static void tce_iommu_detach_group(void *iommu_data,
32 struct iommu_group *iommu_group);
34 static long try_increment_locked_vm(long npages)
36 long ret = 0, locked, lock_limit;
38 if (!current || !current->mm)
39 return -ESRCH; /* process exited */
44 down_write(¤t->mm->mmap_sem);
45 locked = current->mm->locked_vm + npages;
46 lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
47 if (locked > lock_limit && !capable(CAP_IPC_LOCK))
50 current->mm->locked_vm += npages;
52 pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current->pid,
54 current->mm->locked_vm << PAGE_SHIFT,
55 rlimit(RLIMIT_MEMLOCK),
56 ret ? " - exceeded" : "");
58 up_write(¤t->mm->mmap_sem);
63 static void decrement_locked_vm(long npages)
65 if (!current || !current->mm || !npages)
66 return; /* process exited */
68 down_write(¤t->mm->mmap_sem);
69 if (WARN_ON_ONCE(npages > current->mm->locked_vm))
70 npages = current->mm->locked_vm;
71 current->mm->locked_vm -= npages;
72 pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current->pid,
74 current->mm->locked_vm << PAGE_SHIFT,
75 rlimit(RLIMIT_MEMLOCK));
76 up_write(¤t->mm->mmap_sem);
80 * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation
82 * This code handles mapping and unmapping of user data buffers
83 * into DMA'ble space using the IOMMU
86 struct tce_iommu_group {
87 struct list_head next;
88 struct iommu_group *grp;
92 * The container descriptor supports only a single group per container.
93 * Required by the API as the container is not supplied with the IOMMU group
94 * at the moment of initialization.
96 struct tce_container {
100 unsigned long locked_pages;
101 struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES];
102 struct list_head group_list;
105 static long tce_iommu_unregister_pages(struct tce_container *container,
106 __u64 vaddr, __u64 size)
108 struct mm_iommu_table_group_mem_t *mem;
110 if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK))
113 mem = mm_iommu_find(vaddr, size >> PAGE_SHIFT);
117 return mm_iommu_put(mem);
120 static long tce_iommu_register_pages(struct tce_container *container,
121 __u64 vaddr, __u64 size)
124 struct mm_iommu_table_group_mem_t *mem = NULL;
125 unsigned long entries = size >> PAGE_SHIFT;
127 if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK) ||
128 ((vaddr + size) < vaddr))
131 ret = mm_iommu_get(vaddr, entries, &mem);
135 container->enabled = true;
140 static long tce_iommu_userspace_view_alloc(struct iommu_table *tbl)
142 unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) *
143 tbl->it_size, PAGE_SIZE);
147 BUG_ON(tbl->it_userspace);
149 ret = try_increment_locked_vm(cb >> PAGE_SHIFT);
155 decrement_locked_vm(cb >> PAGE_SHIFT);
158 tbl->it_userspace = uas;
163 static void tce_iommu_userspace_view_free(struct iommu_table *tbl)
165 unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) *
166 tbl->it_size, PAGE_SIZE);
168 if (!tbl->it_userspace)
171 vfree(tbl->it_userspace);
172 tbl->it_userspace = NULL;
173 decrement_locked_vm(cb >> PAGE_SHIFT);
176 static bool tce_page_is_contained(struct page *page, unsigned page_shift)
179 * Check that the TCE table granularity is not bigger than the size of
180 * a page we just found. Otherwise the hardware can get access to
181 * a bigger memory chunk that it should.
183 return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift;
186 static inline bool tce_groups_attached(struct tce_container *container)
188 return !list_empty(&container->group_list);
191 static long tce_iommu_find_table(struct tce_container *container,
192 phys_addr_t ioba, struct iommu_table **ptbl)
196 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
197 struct iommu_table *tbl = container->tables[i];
200 unsigned long entry = ioba >> tbl->it_page_shift;
201 unsigned long start = tbl->it_offset;
202 unsigned long end = start + tbl->it_size;
204 if ((start <= entry) && (entry < end)) {
214 static int tce_iommu_enable(struct tce_container *container)
217 unsigned long locked;
218 struct iommu_table_group *table_group;
219 struct tce_iommu_group *tcegrp;
222 return -ESRCH; /* process exited */
224 if (container->enabled)
228 * When userspace pages are mapped into the IOMMU, they are effectively
229 * locked memory, so, theoretically, we need to update the accounting
230 * of locked pages on each map and unmap. For powerpc, the map unmap
231 * paths can be very hot, though, and the accounting would kill
232 * performance, especially since it would be difficult to impossible
233 * to handle the accounting in real mode only.
235 * To address that, rather than precisely accounting every page, we
236 * instead account for a worst case on locked memory when the iommu is
237 * enabled and disabled. The worst case upper bound on locked memory
238 * is the size of the whole iommu window, which is usually relatively
239 * small (compared to total memory sizes) on POWER hardware.
241 * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits,
242 * that would effectively kill the guest at random points, much better
243 * enforcing the limit based on the max that the guest can map.
245 * Unfortunately at the moment it counts whole tables, no matter how
246 * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups
247 * each with 2GB DMA window, 8GB will be counted here. The reason for
248 * this is that we cannot tell here the amount of RAM used by the guest
249 * as this information is only available from KVM and VFIO is
252 * So we do not allow enabling a container without a group attached
253 * as there is no way to know how much we should increment
254 * the locked_vm counter.
256 if (!tce_groups_attached(container))
259 tcegrp = list_first_entry(&container->group_list,
260 struct tce_iommu_group, next);
261 table_group = iommu_group_get_iommudata(tcegrp->grp);
265 if (!table_group->tce32_size)
268 locked = table_group->tce32_size >> PAGE_SHIFT;
269 ret = try_increment_locked_vm(locked);
273 container->locked_pages = locked;
275 container->enabled = true;
280 static void tce_iommu_disable(struct tce_container *container)
282 if (!container->enabled)
285 container->enabled = false;
290 decrement_locked_vm(container->locked_pages);
293 static void *tce_iommu_open(unsigned long arg)
295 struct tce_container *container;
297 if ((arg != VFIO_SPAPR_TCE_IOMMU) && (arg != VFIO_SPAPR_TCE_v2_IOMMU)) {
298 pr_err("tce_vfio: Wrong IOMMU type\n");
299 return ERR_PTR(-EINVAL);
302 container = kzalloc(sizeof(*container), GFP_KERNEL);
304 return ERR_PTR(-ENOMEM);
306 mutex_init(&container->lock);
307 INIT_LIST_HEAD_RCU(&container->group_list);
309 container->v2 = arg == VFIO_SPAPR_TCE_v2_IOMMU;
314 static int tce_iommu_clear(struct tce_container *container,
315 struct iommu_table *tbl,
316 unsigned long entry, unsigned long pages);
317 static void tce_iommu_free_table(struct iommu_table *tbl);
319 static void tce_iommu_release(void *iommu_data)
321 struct tce_container *container = iommu_data;
322 struct iommu_table_group *table_group;
323 struct tce_iommu_group *tcegrp;
326 while (tce_groups_attached(container)) {
327 tcegrp = list_first_entry(&container->group_list,
328 struct tce_iommu_group, next);
329 table_group = iommu_group_get_iommudata(tcegrp->grp);
330 tce_iommu_detach_group(iommu_data, tcegrp->grp);
334 * If VFIO created a table, it was not disposed
335 * by tce_iommu_detach_group() so do it now.
337 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
338 struct iommu_table *tbl = container->tables[i];
343 tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
344 tce_iommu_free_table(tbl);
347 tce_iommu_disable(container);
348 mutex_destroy(&container->lock);
353 static void tce_iommu_unuse_page(struct tce_container *container,
358 page = pfn_to_page(hpa >> PAGE_SHIFT);
362 static int tce_iommu_prereg_ua_to_hpa(unsigned long tce, unsigned long size,
363 unsigned long *phpa, struct mm_iommu_table_group_mem_t **pmem)
366 struct mm_iommu_table_group_mem_t *mem;
368 mem = mm_iommu_lookup(tce, size);
372 ret = mm_iommu_ua_to_hpa(mem, tce, phpa);
381 static void tce_iommu_unuse_page_v2(struct iommu_table *tbl,
384 struct mm_iommu_table_group_mem_t *mem = NULL;
386 unsigned long hpa = 0;
387 unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
389 if (!pua || !current || !current->mm)
392 ret = tce_iommu_prereg_ua_to_hpa(*pua, IOMMU_PAGE_SIZE(tbl),
395 pr_debug("%s: tce %lx at #%lx was not cached, ret=%d\n",
396 __func__, *pua, entry, ret);
398 mm_iommu_mapped_dec(mem);
403 static int tce_iommu_clear(struct tce_container *container,
404 struct iommu_table *tbl,
405 unsigned long entry, unsigned long pages)
407 unsigned long oldhpa;
409 enum dma_data_direction direction;
411 for ( ; pages; --pages, ++entry) {
412 direction = DMA_NONE;
414 ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction);
418 if (direction == DMA_NONE)
422 tce_iommu_unuse_page_v2(tbl, entry);
426 tce_iommu_unuse_page(container, oldhpa);
432 static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa)
434 struct page *page = NULL;
435 enum dma_data_direction direction = iommu_tce_direction(tce);
437 if (get_user_pages_fast(tce & PAGE_MASK, 1,
438 direction != DMA_TO_DEVICE, &page) != 1)
441 *hpa = __pa((unsigned long) page_address(page));
446 static long tce_iommu_build(struct tce_container *container,
447 struct iommu_table *tbl,
448 unsigned long entry, unsigned long tce, unsigned long pages,
449 enum dma_data_direction direction)
454 enum dma_data_direction dirtmp;
456 for (i = 0; i < pages; ++i) {
457 unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
459 ret = tce_iommu_use_page(tce, &hpa);
463 page = pfn_to_page(hpa >> PAGE_SHIFT);
464 if (!tce_page_is_contained(page, tbl->it_page_shift)) {
471 ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp);
473 tce_iommu_unuse_page(container, hpa);
474 pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
475 __func__, entry << tbl->it_page_shift,
480 if (dirtmp != DMA_NONE)
481 tce_iommu_unuse_page(container, hpa);
483 tce += IOMMU_PAGE_SIZE(tbl);
487 tce_iommu_clear(container, tbl, entry, i);
492 static long tce_iommu_build_v2(struct tce_container *container,
493 struct iommu_table *tbl,
494 unsigned long entry, unsigned long tce, unsigned long pages,
495 enum dma_data_direction direction)
500 enum dma_data_direction dirtmp;
502 for (i = 0; i < pages; ++i) {
503 struct mm_iommu_table_group_mem_t *mem = NULL;
504 unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl,
507 ret = tce_iommu_prereg_ua_to_hpa(tce, IOMMU_PAGE_SIZE(tbl),
512 page = pfn_to_page(hpa >> PAGE_SHIFT);
513 if (!tce_page_is_contained(page, tbl->it_page_shift)) {
518 /* Preserve offset within IOMMU page */
519 hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK;
522 /* The registered region is being unregistered */
523 if (mm_iommu_mapped_inc(mem))
526 ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp);
528 /* dirtmp cannot be DMA_NONE here */
529 tce_iommu_unuse_page_v2(tbl, entry + i);
530 pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
531 __func__, entry << tbl->it_page_shift,
536 if (dirtmp != DMA_NONE)
537 tce_iommu_unuse_page_v2(tbl, entry + i);
541 tce += IOMMU_PAGE_SIZE(tbl);
545 tce_iommu_clear(container, tbl, entry, i);
550 static long tce_iommu_create_table(struct tce_container *container,
551 struct iommu_table_group *table_group,
556 struct iommu_table **ptbl)
558 long ret, table_size;
560 table_size = table_group->ops->get_table_size(page_shift, window_size,
565 ret = try_increment_locked_vm(table_size >> PAGE_SHIFT);
569 ret = table_group->ops->create_table(table_group, num,
570 page_shift, window_size, levels, ptbl);
572 WARN_ON(!ret && !(*ptbl)->it_ops->free);
573 WARN_ON(!ret && ((*ptbl)->it_allocated_size != table_size));
575 if (!ret && container->v2) {
576 ret = tce_iommu_userspace_view_alloc(*ptbl);
578 (*ptbl)->it_ops->free(*ptbl);
582 decrement_locked_vm(table_size >> PAGE_SHIFT);
587 static void tce_iommu_free_table(struct iommu_table *tbl)
589 unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT;
591 tce_iommu_userspace_view_free(tbl);
592 tbl->it_ops->free(tbl);
593 decrement_locked_vm(pages);
596 static long tce_iommu_ioctl(void *iommu_data,
597 unsigned int cmd, unsigned long arg)
599 struct tce_container *container = iommu_data;
604 case VFIO_CHECK_EXTENSION:
606 case VFIO_SPAPR_TCE_IOMMU:
607 case VFIO_SPAPR_TCE_v2_IOMMU:
611 ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg);
615 return (ret < 0) ? 0 : ret;
617 case VFIO_IOMMU_SPAPR_TCE_GET_INFO: {
618 struct vfio_iommu_spapr_tce_info info;
619 struct tce_iommu_group *tcegrp;
620 struct iommu_table_group *table_group;
622 if (!tce_groups_attached(container))
625 tcegrp = list_first_entry(&container->group_list,
626 struct tce_iommu_group, next);
627 table_group = iommu_group_get_iommudata(tcegrp->grp);
632 minsz = offsetofend(struct vfio_iommu_spapr_tce_info,
635 if (copy_from_user(&info, (void __user *)arg, minsz))
638 if (info.argsz < minsz)
641 info.dma32_window_start = table_group->tce32_start;
642 info.dma32_window_size = table_group->tce32_size;
645 if (copy_to_user((void __user *)arg, &info, minsz))
650 case VFIO_IOMMU_MAP_DMA: {
651 struct vfio_iommu_type1_dma_map param;
652 struct iommu_table *tbl = NULL;
654 enum dma_data_direction direction;
656 if (!container->enabled)
659 minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
661 if (copy_from_user(¶m, (void __user *)arg, minsz))
664 if (param.argsz < minsz)
667 if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ |
668 VFIO_DMA_MAP_FLAG_WRITE))
671 num = tce_iommu_find_table(container, param.iova, &tbl);
675 if ((param.size & ~IOMMU_PAGE_MASK(tbl)) ||
676 (param.vaddr & ~IOMMU_PAGE_MASK(tbl)))
679 /* iova is checked by the IOMMU API */
680 if (param.flags & VFIO_DMA_MAP_FLAG_READ) {
681 if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
682 direction = DMA_BIDIRECTIONAL;
684 direction = DMA_TO_DEVICE;
686 if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
687 direction = DMA_FROM_DEVICE;
692 ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr);
697 ret = tce_iommu_build_v2(container, tbl,
698 param.iova >> tbl->it_page_shift,
700 param.size >> tbl->it_page_shift,
703 ret = tce_iommu_build(container, tbl,
704 param.iova >> tbl->it_page_shift,
706 param.size >> tbl->it_page_shift,
709 iommu_flush_tce(tbl);
713 case VFIO_IOMMU_UNMAP_DMA: {
714 struct vfio_iommu_type1_dma_unmap param;
715 struct iommu_table *tbl = NULL;
718 if (!container->enabled)
721 minsz = offsetofend(struct vfio_iommu_type1_dma_unmap,
724 if (copy_from_user(¶m, (void __user *)arg, minsz))
727 if (param.argsz < minsz)
730 /* No flag is supported now */
734 num = tce_iommu_find_table(container, param.iova, &tbl);
738 if (param.size & ~IOMMU_PAGE_MASK(tbl))
741 ret = iommu_tce_clear_param_check(tbl, param.iova, 0,
742 param.size >> tbl->it_page_shift);
746 ret = tce_iommu_clear(container, tbl,
747 param.iova >> tbl->it_page_shift,
748 param.size >> tbl->it_page_shift);
749 iommu_flush_tce(tbl);
753 case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: {
754 struct vfio_iommu_spapr_register_memory param;
759 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
762 if (copy_from_user(¶m, (void __user *)arg, minsz))
765 if (param.argsz < minsz)
768 /* No flag is supported now */
772 mutex_lock(&container->lock);
773 ret = tce_iommu_register_pages(container, param.vaddr,
775 mutex_unlock(&container->lock);
779 case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: {
780 struct vfio_iommu_spapr_register_memory param;
785 minsz = offsetofend(struct vfio_iommu_spapr_register_memory,
788 if (copy_from_user(¶m, (void __user *)arg, minsz))
791 if (param.argsz < minsz)
794 /* No flag is supported now */
798 mutex_lock(&container->lock);
799 ret = tce_iommu_unregister_pages(container, param.vaddr,
801 mutex_unlock(&container->lock);
805 case VFIO_IOMMU_ENABLE:
809 mutex_lock(&container->lock);
810 ret = tce_iommu_enable(container);
811 mutex_unlock(&container->lock);
815 case VFIO_IOMMU_DISABLE:
819 mutex_lock(&container->lock);
820 tce_iommu_disable(container);
821 mutex_unlock(&container->lock);
824 case VFIO_EEH_PE_OP: {
825 struct tce_iommu_group *tcegrp;
828 list_for_each_entry(tcegrp, &container->group_list, next) {
829 ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp,
842 static void tce_iommu_release_ownership(struct tce_container *container,
843 struct iommu_table_group *table_group)
847 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
848 struct iommu_table *tbl = container->tables[i];
853 tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
854 tce_iommu_userspace_view_free(tbl);
856 iommu_release_ownership(tbl);
858 container->tables[i] = NULL;
862 static int tce_iommu_take_ownership(struct tce_container *container,
863 struct iommu_table_group *table_group)
867 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
868 struct iommu_table *tbl = table_group->tables[i];
870 if (!tbl || !tbl->it_map)
873 rc = tce_iommu_userspace_view_alloc(tbl);
875 rc = iommu_take_ownership(tbl);
878 for (j = 0; j < i; ++j)
879 iommu_release_ownership(
880 table_group->tables[j]);
886 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
887 container->tables[i] = table_group->tables[i];
892 static void tce_iommu_release_ownership_ddw(struct tce_container *container,
893 struct iommu_table_group *table_group)
897 if (!table_group->ops->unset_window) {
902 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
903 table_group->ops->unset_window(table_group, i);
905 table_group->ops->release_ownership(table_group);
908 static long tce_iommu_take_ownership_ddw(struct tce_container *container,
909 struct iommu_table_group *table_group)
912 struct iommu_table *tbl = NULL;
914 if (!table_group->ops->create_table || !table_group->ops->set_window ||
915 !table_group->ops->release_ownership) {
920 table_group->ops->take_ownership(table_group);
923 * If it the first group attached, check if there is
924 * a default DMA window and create one if none as
925 * the userspace expects it to exist.
927 if (!tce_groups_attached(container) && !container->tables[0]) {
928 ret = tce_iommu_create_table(container,
930 0, /* window number */
932 table_group->tce32_size,
933 1, /* default levels */
938 container->tables[0] = tbl;
941 /* Set all windows to the new group */
942 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
943 tbl = container->tables[i];
948 /* Set the default window to a new group */
949 ret = table_group->ops->set_window(table_group, i, tbl);
957 for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
958 table_group->ops->unset_window(table_group, i);
960 table_group->ops->release_ownership(table_group);
965 static int tce_iommu_attach_group(void *iommu_data,
966 struct iommu_group *iommu_group)
969 struct tce_container *container = iommu_data;
970 struct iommu_table_group *table_group;
971 struct tce_iommu_group *tcegrp = NULL;
973 mutex_lock(&container->lock);
975 /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
976 iommu_group_id(iommu_group), iommu_group); */
977 table_group = iommu_group_get_iommudata(iommu_group);
979 if (tce_groups_attached(container) && (!table_group->ops ||
980 !table_group->ops->take_ownership ||
981 !table_group->ops->release_ownership)) {
986 /* Check if new group has the same iommu_ops (i.e. compatible) */
987 list_for_each_entry(tcegrp, &container->group_list, next) {
988 struct iommu_table_group *table_group_tmp;
990 if (tcegrp->grp == iommu_group) {
991 pr_warn("tce_vfio: Group %d is already attached\n",
992 iommu_group_id(iommu_group));
996 table_group_tmp = iommu_group_get_iommudata(tcegrp->grp);
997 if (table_group_tmp->ops != table_group->ops) {
998 pr_warn("tce_vfio: Group %d is incompatible with group %d\n",
999 iommu_group_id(iommu_group),
1000 iommu_group_id(tcegrp->grp));
1006 tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL);
1012 if (!table_group->ops || !table_group->ops->take_ownership ||
1013 !table_group->ops->release_ownership)
1014 ret = tce_iommu_take_ownership(container, table_group);
1016 ret = tce_iommu_take_ownership_ddw(container, table_group);
1019 tcegrp->grp = iommu_group;
1020 list_add(&tcegrp->next, &container->group_list);
1027 mutex_unlock(&container->lock);
1032 static void tce_iommu_detach_group(void *iommu_data,
1033 struct iommu_group *iommu_group)
1035 struct tce_container *container = iommu_data;
1036 struct iommu_table_group *table_group;
1038 struct tce_iommu_group *tcegrp;
1040 mutex_lock(&container->lock);
1042 list_for_each_entry(tcegrp, &container->group_list, next) {
1043 if (tcegrp->grp == iommu_group) {
1050 pr_warn("tce_vfio: detaching unattached group #%u\n",
1051 iommu_group_id(iommu_group));
1055 list_del(&tcegrp->next);
1058 table_group = iommu_group_get_iommudata(iommu_group);
1059 BUG_ON(!table_group);
1061 if (!table_group->ops || !table_group->ops->release_ownership)
1062 tce_iommu_release_ownership(container, table_group);
1064 tce_iommu_release_ownership_ddw(container, table_group);
1067 mutex_unlock(&container->lock);
1070 const struct vfio_iommu_driver_ops tce_iommu_driver_ops = {
1071 .name = "iommu-vfio-powerpc",
1072 .owner = THIS_MODULE,
1073 .open = tce_iommu_open,
1074 .release = tce_iommu_release,
1075 .ioctl = tce_iommu_ioctl,
1076 .attach_group = tce_iommu_attach_group,
1077 .detach_group = tce_iommu_detach_group,
1080 static int __init tce_iommu_init(void)
1082 return vfio_register_iommu_driver(&tce_iommu_driver_ops);
1085 static void __exit tce_iommu_cleanup(void)
1087 vfio_unregister_iommu_driver(&tce_iommu_driver_ops);
1090 module_init(tce_iommu_init);
1091 module_exit(tce_iommu_cleanup);
1093 MODULE_VERSION(DRIVER_VERSION);
1094 MODULE_LICENSE("GPL v2");
1095 MODULE_AUTHOR(DRIVER_AUTHOR);
1096 MODULE_DESCRIPTION(DRIVER_DESC);